Filter element producing machine and method of filter production



Feb. 6, 1951 w. K. MALMSTROM ETAL FILTER ELEMENT PRODUCING MACHINE AND METHOD OF FILTER PRODUCTION 2 Sheets-Sheet l .ZZmrdJJeg/oab.

Filed March 26, 1949 lhECEIblllllllf lllllllxl 2 Sheets-Sheet 2 Feb. 6, 1951 w. K. MALMSTROM ETAL FILTER ELEMENT PRODUCING MACHINE AND METHOD OF FILTER PRODUCTION Filed March 26, 1949 mm k w n ET R. 1.1:

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Patented Feb. 6, 1951 UNITED STATES PATENT OFFICE FILTER EiIEMENT PRODUCING MACHINE AND METHOD OF FILTER PRODUCTION Walter K. Malmstrom and Edward J. Sherlock, Chicago, Ill.

Application March 26, 1949, Serial No. 83,606

Claims.

This invention relates to improvements in the production of filter elements of the type generally used in the lubricant supplying and circulating systems of internal combustion engines, Diesel engines, and other and kindred characters of.

prime movers for ridding the supplied, circulated and recirculated lubricating oil of dirt, sludge, solids, and other detrimental or harmful matters, and maintaining such oil clear, of good color, and possessed of a high degree of friction reducing quality, as well as effecting material oil consumption and service economies.

It is an object of the invention to provide a machine for producing filters of the above indicated character, wherein the same will be evenly and uniformly bodily compacted or compressed throughout their respective areas, whereby to render them efficient as filtering bodies; also, prevent their disintegration or partial disintegration and/or bodily channeling during subsequent use.

Another object of the invention is to provide a machine capable of effecting the economical production of oil filter elements, each of which 7 filter material packs of different densities can be effected, and, if desired, the filter bodies produced in different lengths, each a true replica of the other.

It is furthermore an object of the invention to provide a novel and highly meritorious method of producing filter elements, said elements being of limited size but, nevertheless, affording a maximum of oil filtering area, the efficiency of which will be maintained for and during comparatively long periods of use without deterioration and without bodily or partial bodily parting, with a resultant presence of non-filtering channels or similar disintegrations or imperfections therein. 7 p

The foregoing, as well as other objects, advantages and meritorious teachings of our invention, will be in part .obvious and in part pointed out in the following detailed disclosure thereof, when taken in conjunction with the accompanying drawings, it being understood that the form of the invention presented herein is precise and ,what is now considered to be the best mode of embodying its principles, but that modifications and changes may be made in specific embodiments without departing from its essential features.

In the drawings:

Figure l is a top plan view of the improved machine with parts thereof broken away for convenience of illustration.

Figure 2 is a side elevation of the machine,

' also with parts thereof broken away for convenience of illustration.

Figure 3 is an enlarged fragmentary vertical V transverse section taken on the line 33 of Figure 1, looking in the direction in which the arrows point.

Figure 4 is an enlarged fragmentar vertical section of the filter element compacting and forming end of the machine, showing a filtering element in process of being compacted and jacketed.

Figure 5 is a, detail of a filtering element produced by the machine, portions of said element being shown in elevation and in section,,and an intermediate portion thereof being broken away, and

Fig-ure 6 is an enlarged fragmentary detail, in longitudinal section, taken on the line 66 of Figure 1, looking in the direction in which the arrows point.

Referring in detail to the drawings, the improved machine comprises an elongated substantially rectangular flat bed I supported in a horizontal plane on pillars 2 which may be interbraced, as at 3. Vertical flanges 4 are provided on the opposite parallel sides of said bed. A flat .filter material feed table 5 is positioned adjacent an intermediate portion of the bed 2, transversely thereof, being horizontally supported on spaced bars 5 disposed transversely of the same and of the sides of a sup-porting frame 5 connected to adjacent intermediate portions of the flanged inner side 4 of the bed and having their outer ends fixed to legs 6. Spaced vertical walls I are mounted on the opposite sides of the table and facilitate retention of filter element constituting material thereon as well as its feeding into the filter forming or compacting body 3, hereinafter described in detail. A follower 9, consisting of a fiat sheet-like body, of shape and. size substantially approximating that of the feed table 5, is horizontally hinged, at Iii, to adjacent lwall portions of the filter forming body. Said follower is adapted to be swung vertically on its hinged mounting and, at times, to overlie a pre- 55.

determined amount of filter element constituting look the free end of the follower in closed op- 5 erative position, a locking arm II is pivotally mounted on a vertical bracket I2 attached to an appropriate portion of the feed table support ing frame 6. One end of th arm is engageable with an adjacent portion of the frame 6 to lock said crank handle against rotation.

With rotation of the shaft 22 b the crank handle 25, in a predetermined direction, the pinions 24 thereon will transmit motion to the pusher head connected rack bars. Consequent- 1y, the,pushe1'head I 8 can be selectively moved toward the; forming body 8- into its inletting way, as'aforesaid, or it can be moved away from said over and with adjacent end portion of said fole, forming body out of its inletting opening across lower. When thus engaged, the follower will be retained in somewhat compressing contact'with; the filter element constituting materiai' onatne... feed table, for an obvious pur ose, A cable,,cord

the feed table 5 to a position in proximity to the outei'ii end of said feed table. Thus, filter element constitutingmaterial, arranged on the feed table ahead of the pusherhead I8, can be forced from or the like I3, has one endconne'ctedtoafrefl gtlifedtisble into the forming body 8 through end portion of the hinged follower and passes over a pulle it mounted on the? upperiend iorf; a vertical support I5 connected to the outer. side.-. portion of the machine bed I; the remaining "end of the cable having a suitable counter-weight I6 attachedjthereto. Hence, vertical swinging ofthe follower from a closed operative position to a raised position may be readily eiiectedf 1 The-filter element forming means of the machine consists of an open ended elongated cross sectionally circular tubular body 8 0i appropriate diameter, made of steel or other sufii'ciently sturdy material. This forming body is immovably seated in supports I'I secured, as'shown; to

the upper side of the bed I intermediately-of its ends. Thereby, said forming bodyishorizonta'lly positioned on and parallel to the bed I.- That'portion of the forming body adjacent to andcommunicating with the inner end of the walledfeed table 5 is open, i. e., cut away-in orderthatf'filter element constituting material on"saidjtable can-be fed thereinto. It will be noted that this material inletting opening has its upper side substantially flush or level'with or somewhat below the follower 8, hinged at 9. 40

In order that filter constituting material will be force fed from the feed table 5 into theiforming body 8 via its aforesaidinletting opening or way, a'pusher head I8 is slidablyrece'ivedon,

and transversely of the feed table (see Figure 2); The length of the pusher head'is suchthat it is snugly received between the feed table verticalside walls 7, while its depth permits its enjtry, at times, into said forming body inletting opening to the extent shown in Figure 3; I The inner side of the'pusher head istransversely curved or dished throughout the length thereof, asat I9. The are of such curvature substantial- 13 corresponds to that of the inner peripheral surface of the forming body, whereby when e'n gaged in the inletting opening of the latter, said pusher head inner side will .be flush or, contiguous with said inner peripheral surface. A

Relatively spaced horizontal rack bars 20 are endwise connected to the outer side of? the pusher head I8 and extend transversely over and beyond the feed table 5, where their outer end portions are received through and slidably supported in brackets 2| fixed to appropriate portions of the sides of the supporting frame' 6. A-

horizontal shaft 22, journaled in bearings 23 mounted on the outer end of the frame 6, has spaced pinions 24 mounted on and keyed thereto in positions to individually mesh with the downwardly disposed teeth of the adjacent rack'bars.

One end of the shaft is extended, as shownin Figures 1 and 2 of the drawings, and fixedly mounts a crank handle 25 thereon, for'an obvious purpose. A look pin 25' is movably mounted on the crank handle and, at times; iseng'ag'ed I its'inletting opening. By reversing rotation of the'shaftfl; the pusher head it can b withdrawn. from the inletting opening of the forming body'and moved over the feed table to its initial starting position in proximity to the free or outer endfof the same.

Compactingof the filter element constituting materi'alfin the forming bod 8, and its forming into a predetermined, shapeand' size, is effected zb'y a-tiiublar packing head 26" snugly and slidably re'ceived 'within said forming body.

An elongated tubular member 27, of diameter lessthan the packing head, is disposed longitudinally'of: the machine bed I in co-axial alignment with the forming body 8. One end of the sameis engaged with and connected to the packing head, as shown in Figures 2, 4 and 6. The remaining end is coupled, a at 28, to-the outer end of-a'rod 29 received in and longitudinally of 'a hydraulic or pneumatic ram cylinder 36 and connectedthe piston 3I slidable in said cylinder. The cylinder is fixedly mounted on the bed longitudinally of and adjacent one end portion thereof by means of brackets 32. n A tubular mandrel 33, the length of which substantiallycorresponds to the forming body 8; i's' ariangedin and concentrically thereof. Its inner end and endportio'n is snugly and slidably supportiri'gly engaged in and through the'packing head 26 (see Figures 4 and 6) and, at times, is telescopically engagedin the elongated tubuhammer-21;

To normally retain the mandrel 33 within the forming'body- 8, a coiled compression Spring 3 is longitudinally received in said member 27. One end of the spring has fixed bearing engagement with the coupling 28. Its remaining or forw'ardend thrustingly bears on the adjacent end of acylindrical piece 35 slidably rec'eived in thetubular member and formed with sin-outwardly directed-co-axial andreduced extension 35f. This extension is engaged in the adjacent end of the mandrel, i. e., that end whichabutsjthe piece-35} Thus, it will be unders'tood that the longitudinal thrust of the compression spring 34, housed by the member 2'7,

' will; betransmitted'to themandrelthrough the cylinder'ipieceli'3'5, and that in consequence, said mandrel will be retained wholly within the formin'gibody. However, with rectilinear or longitudinalmovementof the elongated tubular memberZ'Ibythe ram operated rod 29, said member and thespacking head 28 connected thereto, will be permitted try-telescopically snugly engage over and; alongpthe length of the mandrel,. moving from the position shown in dotted lines in Figure 2 tdth'e 'one'shown in Figure 4.

A stopcollar 36 is positioned within, themandrel 33fat an appropriate point intermediately of its"- e'iids and is'immovably connected thereto by a diametrically disposed rivet 31, or the like, for a purpose hereinafter described.

Air or other power fiuid is selectively deliverable to the opposite ends of the ram cylinder 30 for causing rectilinear movement of its piston 3| and rod 29 in a predetermined direction, by means of conduits 3B and 38. The conduits communicate with a suitable valved control 39 (Figures 1 and 2) which has a fluid supply conduit ii) communicatingly connected thereto. By predetermined operation of the control handle 39', fiuid can be selectively transmitted to either end of the ram cylinder and exhausted from the opposite end, whereby to drive the piston and rod plus the tubular member 21 and packing head 28 in either of their two directions of travel. In so doing, it will be seen that the packing head 25 can be moved forwardly into and through the forming body 8 over and along the mandrel 33 from the position shown in Figure 2 to that shown in Figure 4, or vice versa.

A centering chuck 4i, mounted on the inner side of a carriage G2, slidably tracked for limited longitudinal movement on that end portion of the machine bed I opposite the ram cylinder 3! serves to engage and retain the outer end of a filter element (the component parts thereof) in true co-axial alignment with the forming body 8 during and following its production. The slidable mounting portion of the carriage is provided with a screw-lock operable by a handle 53 whereby said carriage, when slidably adjusted to a predetermined position on the machine bed i, can be securely though releasably locked against movement. A contractile coiled spring 44 is disposed longitudinally of the under side of the machine bed, having one end connected to an adjacent part of the slidable carriage mounting, as at 35, and its remaining end to an inwardly spaced immovable fixture 48, also on the under side of said carriage (see Figures 2 and 4). Thereby, outward sliding movement of the centering chuck carriage on the bed I, as when its screw-lock is released by the handle 43, will be resisted by the contractile coiled spring, the purpose of which is hereinafter described.

The form of filter element produced by my improved machine, consists of a tubular metal column or core 47, of the desired length. Said column is perforated throughout the length thereof, as indicated at 88, and preferably rein- 6 column end over and about the first secured end 5|.

In operation of the machine, the packing head 25 and the centering chuck 4| are positioned in the manner shown in Figure 2 of the drawings. A tubular column 41, with the knitted jacket 5| snugly engaged over the same and secured at one end 5! thereto, is positioned longitudinally of the machine bed i between the centering chuck and the adjacent end of the tubular mandrel 33. One end of said column is engaged over the reduced extension on the chuck and the opposite end in the adjacent open end of the mandrel. The centering chuck is now slid longitudinally inwardly over the machine bed toward the adjacent open end of the forming body 8, telescoping the column 41 in the adjacent portion of the tubular mandrel 33 until its inner end is abuttingly engaged with the stop collar 36 therein.

forced to resist crush stresses by circumferential corrugations ":9 formed therein at relatively spaced points. Packed or compressed lint-free thread material, such as cotton waste or the like, is disposed over and formed about the perforate column to constitute a cylindrically shaped filter body 58 whose opposite ends may extend slightly beyond the adjacent ends of said column, all as shown in Figure 5 of the drawings. A tubular jacket 5! of closely knit and, hence, stretchable material is snugly engaged over, about and along the column 47. One end 5i thereof is anchored, in any suitable'manner, to an end of the column. The remaining portion of the jacket is carried outwardly over-that end of the filter body 59 adjacent the remaining column end, reversed upon itself and tautly engaged over, about and along the outer surface of said filter body and over the locked thereover by the arm II.

Thereupon, the free portion of the knitted jacket 5| is reversed upon itself and tautly engaged over and along the reduced and shouldered adjacent end portion 8 of the forming body 8 in the fashion shown in Figure 4 of the drawings. The chuck carriage is then looked against relative movement on the machine bed by its screwlock, operated by the handle 43.

A predetermined amount of filter element constituting material, such as above described, is now placed on and spread evenly over the feed table 5 and the follower 9 is closed and compressively At this time, the shaft 22 is rotated, in a predetermined direction, by its handle 25 causing the rack bars 26 and the pusher head I8 to be moved inwardly over the feed table whereby to discharge the filter element constituting material through the inletting opening in the forming body 3 thereinto and distributed partially over and about the mandrel. supported tubular column 6?. The pusher head. and its rack bars are now returned to their initialv positions with relation to the feed table, its follower P, opened and a second predetermined. charge of filter material placed on said table, as; before. This second charge of filter material is. moved from the feed table into the forming body 8 in the same manner as above described. As.

said second charge is delivered into the forming body, the leading edge thereof will irregularly engage and intimately merge with the adjacent end of the first delivered charge, forcing it over and about the inner sides of the forming body and the tubular column ii. The adjacent ends or edges of the two charges of filter material will thus be irregularly and intimately joined or in terengaged in the manner indicated by the lines identified at E2 in Figure 3, and thereby, will eliminate the presence of objectionable voids in or about the same, as well as placing the material under a certain and beneficial degree of compression.

Movement of the pusher head 18, with its dished inner side 39, from the inletting opening of the forming body 8, is now prevented by looking the crank 25 against rotation by engaging its lock pin 25' with an immovable portion of the frame 5.

With the forming body 8 thus charged with filter element constituting material, the control handle 39 of the valved control 39, is operated to admit power fluid to the outer end of the ram cylinder 30. Thereby, its piston 3| will be engaged and driven through the cylinder, causing V the rod 29 to thrust the elongated tubular mem- 15. b rn211andnthe=r-packing head i-zfi'zmtoeefiectual compressing engagement with the adjacent end of the; filter materiahin; the; forming cloudy; 8 to thatposition. shown in Figure A. of .the drawings;.. With thepacking head inasuch; positiom; the filtelfi mater-ial-fiozwill: have been compressed toragprer. deter-mined .andsatisfactory degree: within. the, forming. body-,8-.:and over andaboutthe tubular perforate. column; 41-.

Ifidesirecl, the inner. iaceof the centering ,chuok 4 l-zmay be annularlydished, aslat. 53:, so that the engaged end ,of. the compressed; filter element constitutingamaterial will :be iconvexedgasindie: sated-.in Figure. 4.

With; the. packing headlfi; compressinglygeng gaging .the .adjacentendpfi the. filter; material; 50; the screwelock .1 of). the .;centerin chuck carria e 42;,is;loosened;,.;by;turning its handle A31. When loosened, the;longitudinalv thrust power; of. the

packing. head in the forming body 8 is entirely sufiici ent to effect longitudinal ejectionrofathe now formed-filter element from the open end of. the forming ,body 8, this ejection being accomplished by the application of an outwarddrivingforce to; thenow released centering chuck car.- riagefl, causing it to be moved against the resistance of the contractile coiled spring 44- to the outward. limit of its movable tracked mounting on the machinebed I.

If desired, thecentering chuck carriage screw.- lock may now be engaged withv anadjacent portion ofthe machine bed, and thereuponthe control handle 39 of the valved control 39 is operated to, exhaust fluid from the first describedend ofthera-m cylinder and to admitv fiuid'through the. conduit .38, to its opposite. end, causing the now advancedcylinder piston 3! to be .returned toitsinitial starting position, as shown indotted lines in Figure 2.

Withthe packing head 28. thus disengagedfrom the inner end of the now. formed filter element, particularly due to its withdrawal from the form: ing body 8, by the elongated tubular member 21'. and the-piston rod 29, said filter element is now ready for removal from the machine...

Itis to be understood, of course, that as the elongated tubular member 2'! is moved to its retracted'position, the tubular mandrel .33'is withdrawn through and from the tubular perforate column 41 of the filter element.

At this point, attention is directed to the fact that as the formed filter element is longitudinally ejected from the forming body 8, under the ejecting Logo of the advancing packing head 26, that portion of the knitted jacket 51 engaged over the reduced end portion 8' of the forming body will be drawn over the outer peripheral portion of the filter element, completely covering or jacketing the same. The inherent elasticity of this knitted jacket will, as hereinbefore indicated; cause it to be tautly arranged over and about the compressed filter material 50. The free end of'the.,.jacket 5|, as hereinbefore explained, is now. turned: inwardly and securingly tucked between thecome pressed filter element and the adjacent'end of the tubular perforate column 4'! adjacent. the first securedend 5|.

While we have hereinbefore described: with some degree of particularity, a form of filter :element which is of -a somewhat elongated characterait will, of course, be fully. understood and appreciated that the improved; machine is capable of, producing. filters 1 of shorter lengths. By the same,- token,,and if required, the machinemay be mployed #9 prqducefilters, o -e en e length 81' than..-that;iorm hereinbefore:described;, Insuch; event or events, 117;;Wil1;b8 understood that the, lengtheof the tubular perforateqcolumn 41' will substantiallyzcorrcspond with the, length of the filter-element to bezplioduced; that, the length of the knittedjacket it will be accordingly varied, and iurthehrmore, that the lengthoi compression travelvof .the packing head 26, as well as the lengthpithetubular mandrel .43, will be appropriately. modified. It is alsotobe understood that by simple adjustment-of the valved control 39,..and/or its duration of operation, the, filter elementconstituting material 50,.may be compressed or, packed in the formingbooly 8 to any particularly desiredor requireddegree of density.

WeclaimL 1.. In a filter ,element producing machine, a filterelejment forming bodyhaving filter material inletting means and] filter element outletting means separate from the inletting means,,a packing head selectivelyslidable' in said body towards or from its outletting means, a tubular mandrel in the body -slidably'engaged with'and through said -head, filter material feed means 00- operatively associated with-the'body' inletting means; said'feed -means adapted, at times; to close said inletting means; andcentering' and supporting means-supportedforqnovement towards and from the-body outletting meansand-the'adjacent endof said tubular mandrel andlockableagainst sue-h movement,

2. -Ina filter element producingmachine, a filter-element forming body having filter material inle'tting means and filten element outletting meanstherein, saidinlettingmeansbeing at substantiallyrightangles to-=the longitudinal axis of the bodyiandiapartlfrom its outlettingmeans, a packing .head. selectively. slidable in said body towards. 01 afrom l itsoutletting imeanspa tubular mandrel inithe body slidably. engaged with and throughsaidhead, filter material feed meanscooperatively associated.v with the .body inletting niean$..-..said feed; means...adapte,d,,. at times, to close said rinletting; means,; and. centering, and supporting ;means,- supported, for movement towardsor frointhe body outlettingmeans and the adjacent end of said tubular mandrel and lockable against such, movement.

3. In. a filter element. producing machine, a tubular filter element forming body having open opposite ends and, afilter material inletting opening therein intermediately of its opposite ends, a packing head slidable in said body, means connected to said head for selectively moving the same in either of two directions in the forming .body, a tubular mandrelin the body slidably engaged withand'through said head, filter materialfeed means cooperatively associated with the bodyinlet-ting opening, said feed means adapted; at times, to close saidinlettingopening, and-centering and supportingmeans-supported for movement 7 towards and" from one openend of the bodyand the'adjacent. end-of said tubular-mandreland lockable against such movement;

4.- In a filter elementproducingmachine,- a filter: element formingbodyhaving filtermaterialuinletting. means andfilterv element. outletting means, a. packing: head slidable. in said body, a,tubular.mandrel in the bodyspacedfrom its,:-,side,; walls: and slidably engaged with. and t r u h said head; a..tubular member connected to isaid; head and extended= beyond the same outwardly, of, same-forming; body, telescopically engageable, at times-over said tubularlmandrel, spring thrust means ,in, the; tubular: member having one end bearing on the tubular mandrel adapted to normally retain the mandrel extended from the tubular member, means connected to said tubular member for selectively moving the same in either of two directions with relation to the forming body, and centering and supporting means'supported for movement towards and from the body outlettin means and the adjacent end of said tubular mandrel and lockable against such movement.

5. In a filter element producing machine, a filter element forming body having open and opposite ends and a filter inletting opening in its side walls intermediately of its opposite open ends, a packing head slidable in the forming body, a tubular mandrel in and disposed longitudinally of said body in spaced relation to its side walls and endwise slidably engaged with and through said packing head, motion transmittin means connected to the packing head for selectively moving the same in either of two directions in the forming body, filter material feed means cooperatively associated with said formin body, a pusher head on said feed means movable thereover into and from said material inletting opening, means for retaining said pusher head engaged, at times, in said inletting opening, and a centering and supporting device supported for movement towards and from one of the opposite open ends of the forming body and lockable against such movement.

6. In a filter element producing machine, a filter element forming body having open opposite ends and a filter material inletting opening in its side walls intermediately of its open opposite ends, a packing head slidable in the formin body, a tubular mandrel in and disposed longitudinally of said body in spaced relation to its side walls and endwise slidably engaged with and through said packing head, motion transmitting means connected to the packing head for selectively moving the same in either of two directions in the forming body, a filter material receiving table cooperatively associated with said forming body, a pusher head on said table movable thereover into and from said material inletting opening in the forming body, one side of said pusher head being formed to correspond to and be contiguous with the adjacent portions of the inner side walls of said forming body when engaged in the material inletting opening therein, means connected to said pusher head for imparting movement in a predetermined direction thereto, other means cooperative with said pusher head movement imparting means for releasably locking the same and securing the pusher head in the forming body inletting opening, and a centering and supportin device supported for movement towards and from one of the opposite'open ends of the forming body and lockable against such movement.

7. In a filter element producing machine, a filter element forming body having filter material inletting means and filter element outletting means separate from the inletting means, a packing head selectively slidable in said body towards or from its outletting means, a tubular mandrel in the body slidably engaged with and through said head, a filter material receiving table cooperatively associated with said forming body, a pusher head on said table movable thereover into and from said filter material inletting means, one side of said pusher head being formed to correspond to and be contiguous with 10 the adjacent portions of theinner side walls of said forming body when engaged in the material inletting means therein, means connected to said pusher head for imparting movement in a predetermined direction thereto, other means cooperative with said pusher head movement imparting means for releasably locking the same and securing the pusher head in the forming body inletting means, and a centering and supporting device supported for movement towards and from the filter material inletting means of the body and lockable against such movement.

8. In a filter element producing machine, a filter element forming tubular body having filter material inletting means and filter element outletting means separate from the inletting means, a packing head selectively slidable in said body towards or from its outletting means, a tubular mandrel in the body slidably engaged with and through said head, a filter material receiving table cooperatively associated with said tubular forming body, a pusher head on said table movable there-' over into and from said material inletting means in the formin body, means connected to said pusher head for imparting movement in a predetermined direction thereto, other means cooperative with said pusher head movement imparting means forreleasably locking the same and securing the pusher head in the forming body inletting means, a substantially sheet-like follower movably mounted on the feed table arrangeable, at times, in spaced substantially parallelism to said table and over said pusher head, and a centering and supporting device supported for movement towards and from the filter material inletting means of the forming body and lockable against such movement.

9. A method for producing a cylindrical tubular filter element, which consists of engaging a tubular column in a forming body in spaced relation to its side walls, introducing and moving a slightly compressed body of filter material into the forming body between its inner side walls and the tubular column transversely of the longitudinal axes of said forming body and tubular column and partly thereabout, then introducing and moving a second slightly compressed body of filter material in the forming body between its said innerside walls and the tubular column transversely of the longitudinal axes thereof and concurrently forcing the first mentioned body of filter material ahead of the same whereby the entire space between the inner side walls of said forming body and tubular column are filled thereby and the adjacent contact ing ends of said two filter material bodies are contacted and interengaged, then longitudinally compressing said bodies of filter material to a predetermined degree and shaping the same to the engaged inner side walls of the forming body and the tubular column, and thereupon ejecting the compressed filter material and column from the tubular forming body.

10. A method for producing a cylindrical tubular filter element, which consists of engaging a tubular column in a tubular forming body in spaced relation to its side walls, introducing and moving a slightly compressed body of filter material into the forming body between its inner side walls and the tubular column transversely of the longitudinal axes of said forming body and tubular column and partly thereabout, then introducing and moving a second slightly compressed body of filter material into the tubular forming body "betweenits said: inner side-Wells and {the tubular eco'lumn transversely "bf the "'lor'igitudinal axes thereof 'and- "concurrenfly forcing-Mae" first mentioned body of filter material-ahesld bf the-same whereby the entire space between the inner-"side walls of said'tubmar'forming body afidtubialar column .are, filld' thereby and 'the' adjacent constacti ng ends of said twdfilter materialbodiesare "intimately engagedgthen longitudinally compress- Vingsaid bddiesof filtermaterial to apredetermined degree. alridyshaping the 's'etme to the engaged inner side*'wzt11sof the' tubular'forr'ning ing the compressed filteri material and tubular column -from the tubulaf ferming body, and con- *cur-reiit1y"-with -s1i'ch ejection; tautly -engaging a jeieket'bverandabout the -outer' sides and 'efids 0fsaid compressed 'filter" material adjacent the opposite ends bfithe tubular cblumn and' seeminthe'same betweerrsaid ends 'of the compressed materihr and- 'c'olumn.

.WQALTER K. MALMSTROM.

J. "SHERLOCK.

-No-references cited. 

